[MDEV-13139] Package-wide variables in CREATE PACKAGE - Jira

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As of version 10.4, MariaDB supports package variables in CREATE PACKAGE BODY only.

Under terms of this task we'll also allow package wide-variables in the CREATE PACKAGE statement.

Example:

DROP PACKAGE pkg1;

DELIMITER $$

CREATE PACKAGE pkg1

AS

  m_count INT:= 0;

  FUNCTION get_count RETURN INT;

  PROCEDURE set_count(new_count INT);

END;

$$

CREATE PACKAGE BODY pkg1

AS

  FUNCTION get_count RETURN INT

AS

  BEGIN

    m_count:= m_count + 1;

    RETURN m_count;

  END;

  PROCEDURE set_count(new_count INT)

AS

  BEGIN

    m_count:= new_count;

  END;

END;

$$

DELIMITER ;

SELECT pkg1.get_count() FROM dual; -- this returns 1

SELECT pkg1.get_count() FROM dual; -- this returns 2

CALL pkg1.set_count(30);

SELECT pkg1.get_count() FROM dual;  -- this returns 31

Note, unlike stored routines parameters, package-wide VARCHAR variables must be declared with length.

Package variables are initialized on the first package invocation in the current session.

Variable declarations may not refer to functions declared in the same package. So this script will return an error:

DROP PACKAGE pkg1;

DELIMITER $$

CREATE PACKAGE pkg1

AS

  m_count INT:= init_count();

  FUNCTION init_count RETURN INT;

END;

$$

is blocked by

MDEV-13292 Move the code from sp_head::init() to sp_head::sp_head()

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